I don't have a reference for this but I know of a dissertation written on the
belief in some parts of Central America that relatives, children et al., are
kidnapped and taken to America to be processed as ham and resold in cans in
stores. This completes the picture of economic woes, that the north is
"devouring" poorer peasants and reselling them back to their families.
All of this, of course, has no reference, but I remember attending a
lecture on this work by a PhD candidate from the University of Chicago(?)
Sorry about the lack of a source.